Just got my hands on the Rayson SD-220B and overall, I'm impressed! The dual-handle system is genius - punching holes with one hand while prepping the comb with the other saves so much time.

The build quality feels premium with all that metal construction. It's definitely heavier than my old machine, but that just means it'll last longer. Punched through 15 sheets of 80gsm paper like butter during my first test.

However, I did notice the hole spacing isn't perfectly standard when using longer paper sizes. And while it claims to handle 22 sheets, I found 15-18 to be the sweet spot for smooth operation.

For office projects and school work, this machine is a champ. The adjustable punching blades are super convenient when switching between different document sizes. Just wish the comb opener had a bit more range.

At this price point, it's definitely worth the investment if you do regular binding work. Not perfect, but way better than cheaper alternatives I've tried!